Wow, running 36 cores with only half a gigabyte of heap memory is *really* optimistic!
I'd raise the heap size to some gigabytes at least and see how it's working then. -Michael Am 14.02.2017 um 15:23 schrieb Leon STRINGER: > Further background on the environment: > > There are 36 cores, with a total size of 131 MB (based on the size reported by > "Master (Searching)" in the web console). > > The Java memory parameters in use are: -Xms512m -Xmx512m. > >> On 14 February 2017 at 05:45 Erick Erickson <erickerick...@gmail.com> >> wrote: >> >> GCViewer is a nifty tool for visualizing the GC activity BTW. >> > I don't know what I'm looking for but for a log covering a 3-hour period today > the "Summary" tab says (typed manually, apologies for any mistakes): > > Total heap (usage / alloc. max): 490.7M (100.0%) / 490.7M > > Max heap after conc GC: 488.7M (99.6%) > > Max tenured after conc GC: 382M (99.5% / 77.9%) > > Max heap after full GC: 490M (99.9%) > > Freed Memory: 141,811.4M > > Freed Mem/Min: 748.554M/min > > Total Time: 3h9m26s > > Accumulated pauses: 883.6s > > Throughput: 92.23% > > Number of full gc pauses: 476 > > Full GC Performance: 101.4M/s > > Number of gc pauses: 15153 > > GC Performance: 245.5M/s > > > "Memory" tab: > > Total heap (usage / alloc. max): 490.7M (100.0%) / 490.7M > > Tenured heap (usage / alloc. max): 384M (100.0%) / 384M > > Young heap (usage / alloc. max): 106.7M (100.0%) / 106.7M > > Perm heap (usage / alloc. max): 205.6M (17.0%) / 1,212M > > Max tenured after conc GC: 382M (99.5% / 77.9%) > > Avg tenured after conc GC: 247.5M (delta=17.612M) > > Max heap after conc GC: 488.7M (99.6%) > > Avg heap after conc GC: 252.6M (delta=35.751M) > > Max heap after full GC: 490M (99.9%) > > Avg heap after full GC: 379M (delta=72.917M) > > Avg after GC: 359.9M (delta=40.965M) > > Freed by full GC: 47,692.8M (33.6%) > > Freed by GC: 94,118.7M (66.4%) > > Avg freed full GC: 100.2M/coll (delta=68.015M) [greyed] > > Avg freed GC: 6,360.3K/coll (delta=19.963M) [greyed] > > Avg rel inc after FGC: -199,298B/coll > > Avg rel inc after GC: 6,360.3K/coll (delta=19.963M) > > Slope full GC: -126,380B/s > > Slope GC: 14.317M/s > > InitiatingOccFraction (avg / max): 65.9% / 100.0% > > Avg promotion: 2,215.324K/coll (delta=6,904.174K) [greyed] > > Total promotion: 12,504.467M > > > Can anyone can shed any light on this? Is it a problem or is this all normal? > > Thanks, > > Leon Stringer
